Hello Dr. Rick

I m developing wilmink model for cattle lactation data set.. I need to run NLMIXED in sas. this model has 4 parameters and one predictor variable.

so please help me to write the SAS codes for that.

I used following codes. but I dont know how to write them. please help me

Data Lactation;
Input Parity DIM Yield;
Cards;
8 1 .

;
proc nlmixed;
parms a=5, b=0.1, c=0.1, d=0.1;
model yield = a-(b*dim)-(c*exp(-d*dim));
random a b c d ([0,0,0,0}, ) subjects =
run;